package/lmbench: fix build with recent gcc versions

lmbench dependency discovery relies on implicit return types for
main().  This causes compiler errors when -Wimplicit-int is enabled,
which has become the default with recent gcc versions. The failure of
the dependcy discovery causes lmbench to redifine typedefs the
compiler already has in an incompatible manner. Add a patch to fix the
discovery.

Fixes:
bench.h:81:13: error: conflicting types for ‘socklen_t’; have ‘int’
   81 | typedef int socklen_t;

bench.h:85:15: error: conflicting types for ‘off64_t’; have ‘int64’ {aka ‘long long int’}
   85 | typedef int64 off64_t;

Fixes:

  http://autobuild.buildroot.net/results/33cf97a79125c20f67f620eb6a7b5ad2206b2503/

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/lmbench/0006-scripts-build-int-return-type-main.patch

@@ -0,0 +1,204 @@
+From 3340c9552cc6e7d77adf39becbc6be52233d80c0 Mon Sep 17 00:00:00 2001
+From: Charlie Jenkins <charlie@rivosinc.com>
+Date: Thu, 10 Apr 2025 13:25:07 -0700
+Subject: [PATCH] scripts/build: int return type main()
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Some compilers (such as the bootlin riscv64-lp64d glibc bleeding-edge
+2024.05-1 toolchain) fail to run the dependency checking scripts and
+error at "return type defaults to ‘int’ [-Wimplicit-int]". Add types
+to these main() functions to allow this dependency tracking to work.
+
+Upstream: dead
+Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
+---
+ scripts/build | 42 +++++++++++++++++++++---------------------
+ 1 file changed, 21 insertions(+), 21 deletions(-)
+
+diff --git a/scripts/build b/scripts/build
+index 4820d80..2c8a50a 100755
+--- a/scripts/build
++++ b/scripts/build
+@@ -51,14 +51,14 @@ fi
+ 
+ # check for bcopy (optionally set the SYS5 flag)
+ echo "#include <string.h>" > ${BASE}$$.c
+-echo "main() { char a[256], b[256]; bcopy(a, b, 256); }" >> ${BASE}$$.c
++echo "int main() { char a[256], b[256]; bcopy(a, b, 256); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	|| CFLAGS="${CFLAGS} -DSYS5"
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ 
+ # check for valloc
+ echo "#include <stdlib.h>" > ${BASE}$$.c
+-echo "main() { char* buf = valloc(123); }" >> ${BASE}$$.c
++echo "int main() { char* buf = valloc(123); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	|| CFLAGS="${CFLAGS} -Dvalloc=malloc"
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -67,7 +67,7 @@ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ echo "#include <stdlib.h>" > ${BASE}$$.c
+ echo "#include <sys/types.h>" >> ${BASE}$$.c
+ echo "#include <unistd.h>" >> ${BASE}$$.c
+-echo "main() { off64_t off; }" >> ${BASE}$$.c
++echo "int main() { off64_t off; }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_off64_t"
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -76,7 +76,7 @@ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ echo "#include <stdlib.h>" > ${BASE}$$.c
+ echo "#include <sys/types.h>" >> ${BASE}$$.c
+ echo "#include <unistd.h>" >> ${BASE}$$.c
+-echo "main() { int fd = 0; off64_t off = 0; off = lseek64(fd, off, SEEK_SET); }" >> ${BASE}$$.c
++echo "int main() { int fd = 0; off64_t off = 0; off = lseek64(fd, off, SEEK_SET); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_lseek64"
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -88,7 +88,7 @@ echo "#include <sys/resource.h>" >> ${BASE}$$.c
+ echo "#ifndef RUSAGE_SELF" >> ${BASE}$$.c
+ echo "#define RUSAGE_SELF 0" >> ${BASE}$$.c
+ echo "#endif /* RUSAGE_SELF */" >> ${BASE}$$.c
+-echo "main() { struct rusage ru; getrusage(RUSAGE_SELF, &ru); }" >> ${BASE}$$.c
++echo "int main() { struct rusage ru; getrusage(RUSAGE_SELF, &ru); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DRUSAGE"
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -136,13 +136,13 @@ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ 
+ # check for OSs that have S_IFFIFO instead of S_IFIFO
+ echo "#include <sys/stat.h>" > ${BASE}$$.c
+-echo "main() { return (S_IFIFO); }" >> ${BASE}$$.c
++echo "int main() { return (S_IFIFO); }" >> ${BASE}$$.c
+ if ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL}; then
+ 	true;
+ else
+ 	rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ 	echo "#include <sys/stat.h>" > ${BASE}$$.c
+-	echo "main() { return (S_IFFIFO); }" >> ${BASE}$$.c
++	echo "int main() { return (S_IFFIFO); }" >> ${BASE}$$.c
+ 	${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 		|| CFLAGS="${CFLAGS} -DS_IFIFO=S_IFFIFO"
+ fi
+@@ -151,7 +151,7 @@ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ # check that we have uint
+ echo "#include <stdlib.h>" > ${BASE}$$.c
+ echo "#include <sys/types.h>" >> ${BASE}$$.c
+-echo "main() { uint i = 0; return (i); }" >> ${BASE}$$.c
++echo "int main() { uint i = 0; return (i); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_uint=1";
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -161,7 +161,7 @@ HAVE_uint64=0
+ echo "#include <stdlib.h>" > ${BASE}$$.c
+ echo "#include <sys/types.h>" >> ${BASE}$$.c
+ echo "#include <rpc/types.h>" >> ${BASE}$$.c
+-echo "main() { uint64 i = 0; return (int)(i); }" >> ${BASE}$$.c
++echo "int main() { uint64 i = 0; return (int)(i); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_uint64=1" && HAVE_uint64=1;
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -170,7 +170,7 @@ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ if [ ${HAVE_uint64} = 0 ]; then
+     echo "#include <stdlib.h>" > ${BASE}$$.c
+     echo "#include <sys/types.h>" >> ${BASE}$$.c
+-    echo "main() { uint64_t i = 0; return (int)(i); }" >> ${BASE}$$.c
++    echo "int main() { uint64_t i = 0; return (int)(i); }" >> ${BASE}$$.c
+     ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_uint64_t=1";
+     rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -181,7 +181,7 @@ HAVE_int64=0
+ echo "#include <stdlib.h>" > ${BASE}$$.c
+ echo "#include <sys/types.h>" >> ${BASE}$$.c
+ echo "#include <rpc/types.h>" >> ${BASE}$$.c
+-echo "main() { int64 i = 0; return (int)(i); }" >> ${BASE}$$.c
++echo "int main() { int64 i = 0; return (int)(i); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_int64=1" && HAVE_int64=1;
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -190,7 +190,7 @@ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ if [ ${HAVE_int64} = 0 ]; then
+     echo "#include <stdlib.h>" > ${BASE}$$.c
+     echo "#include <sys/types.h>" >> ${BASE}$$.c
+-    echo "main() { int64_t i = 0; return (int)(i); }" >> ${BASE}$$.c
++    echo "int main() { int64_t i = 0; return (int)(i); }" >> ${BASE}$$.c
+     ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_int64_t=1";
+     rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -209,15 +209,15 @@ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ echo "#include <stdlib.h>" > ${BASE}$$.c
+ echo "#include <sys/types.h>" >> ${BASE}$$.c
+ echo "#include <sys/socket.h>" >> ${BASE}$$.c
+-echo "main() { int s; struct sockaddr dest; socklen_t len; getsockname(s, &dest, &len); }" >> ${BASE}$$.c
+-${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
++echo "int main() { int s; struct sockaddr dest; socklen_t len; getsockname(s, &dest, &len); }" >> ${BASE}$$.c
++${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_socklen_t"
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ 
+ # check that we have drand48 and srand48
+ HAVE_RANDOM=0
+ echo "#include <stdlib.h>" > ${BASE}$$.c
+-echo "main() { srand48(973); return (int)(1.0E9 * drand48()); }" >> ${BASE}$$.c
++echo "int main() { srand48(973); return (int)(1.0E9 * drand48()); }" >> ${BASE}$$.c
+ if ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL}; then
+ 	CFLAGS="${CFLAGS} -DHAVE_DRAND48"
+ 	HAVE_RANDOM=1
+@@ -226,7 +226,7 @@ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ 
+ if [ ${HAVE_RANDOM} -eq 0 ]; then
+     echo "#include <stdlib.h>" > ${BASE}$$.c
+-    echo "main() { srand(973); return (10 * rand()) / RAND_MAX; }" >> ${BASE}$$.c
++    echo "int main() { srand(973); return (10 * rand()) / RAND_MAX; }" >> ${BASE}$$.c
+     if ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL}; then
+ 	CFLAGS="${CFLAGS} -DHAVE_RAND"
+ 	HAVE_RANDOM=1
+@@ -236,7 +236,7 @@ fi
+ 
+ if [ ${HAVE_RANDOM} -eq 0 ]; then
+     echo "#include <stdlib.h>" > ${BASE}$$.c
+-    echo "main() { srandom(973); return (10 * random()) / RAND_MAX; }" >> ${BASE}$$.c
++    echo "int main() { srandom(973); return (10 * random()) / RAND_MAX; }" >> ${BASE}$$.c
+     if ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL}; then
+ 	CFLAGS="${CFLAGS} -DHAVE_RANDOM"
+ 	HAVE_RANDOM=1
+@@ -247,7 +247,7 @@ fi
+ # check that we have sysmp
+ echo "#include <sys/types.h>" > ${BASE}$$.c
+ echo "#include <sys/sysmp.h>" >> ${BASE}$$.c
+-echo "main() { return (int)sysmp(MP_NPROCS); }" >> ${BASE}$$.c
++echo "int main() { return (int)sysmp(MP_NPROCS); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_SYSMP=1";
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -257,7 +257,7 @@ echo "#include <stdlib.h>" > ${BASE}$$.c
+ echo "#include <unistd.h>" >> ${BASE}$$.c
+ echo "#include <sys/types.h>" >> ${BASE}$$.c
+ echo "#include <sys/processor.h>" >> ${BASE}$$.c
+-echo "main() { return bindprocessor(BINDPROCESS, getpid(), 0); }" >> ${BASE}$$.c
++echo "int main() { return bindprocessor(BINDPROCESS, getpid(), 0); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_BINDPROCESSOR=1";
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -267,7 +267,7 @@ echo "#include <stdlib.h>" > ${BASE}$$.c
+ echo "#include <sys/types.h>" >> ${BASE}$$.c
+ echo "#include <sys/processor.h>" >> ${BASE}$$.c
+ echo "#include <sys/procset.h>" >> ${BASE}$$.c
+-echo "main() { return processor(P_PID, P_MYPID, 0, NULL); }" >> ${BASE}$$.c
++echo "int main() { return processor(P_PID, P_MYPID, 0, NULL); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_BINDPROCESSOR=1";
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+@@ -276,7 +276,7 @@ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+ echo "#include <stdlib.h>" > ${BASE}$$.c
+ echo "#include <unistd.h>" >> ${BASE}$$.c
+ echo "#include <sched.h>" >> ${BASE}$$.c
+-echo "main() { unsigned long mask = 1; return sched_setaffinity(0, sizeof(unsigned long), &mask); }" >> ${BASE}$$.c
++echo "int main() { unsigned long mask = 1; return sched_setaffinity(0, sizeof(unsigned long), &mask); }" >> ${BASE}$$.c
+ ${CC} ${CFLAGS} -o ${BASE}$$ ${BASE}$$.c ${LDLIBS} 1>${NULL} 2>${NULL} \
+ 	&& CFLAGS="${CFLAGS} -DHAVE_SCHED_SETAFFINITY=1";
+ rm -f ${BASE}$$ ${BASE}$$.o ${BASE}$$.c
+-- 
+2.43.0
+