diff options
| author | Florian Weimer <fweimer@redhat.com> | 2023-01-17 19:07:54 +0100 |
|---|---|---|
| committer | Karl Williamson <khw@cpan.org> | 2023-01-17 13:44:03 -0700 |
| commit | fc35cee89c1a42558f50a37a6b4d5186b77f058b (patch) | |
| tree | 6283b9197ac0aea6b8a2801b2bb78963f83f91fc | |
| parent | f66c11c3e32e1e5053ce359dca623032705e25b9 (diff) | |
| download | perl-fc35cee89c1a42558f50a37a6b4d5186b77f058b.tar.gz | |
Configure: Add various C99 compatibility improvements
Two C99 compatibility issues are fixed by these changes: Return
types are made explicit where they previously defaulted to int,
and all called functions are now declared explicitly (either by
including additional headers, or by adding prototypes manually).
This avoids implict ints and implicit function declarations,
both legacy C language features removed in the 1999 revision
of the language.
Verified with an instrumented GCC compiler on GNU/Linux.
| -rwxr-xr-x | Configure | 16 |
1 files changed, 11 insertions, 5 deletions
@@ -4655,7 +4655,7 @@ esac # so we will take those off from locincpth. case "$gccversion" in 3.*) - echo "main(){}">try.c + echo "int main(){}">try.c for incdir in $locincpth; do warn=`$cc $ccflags -I$incdir -c try.c 2>&1 | \ grep '^c[cp]p*[01]: warning: changing search order '` @@ -5798,6 +5798,7 @@ case "$intsize" in #ifdef I_STDLIB #include <stdlib.h> #endif +#include <stdio.h> int main() { printf("intsize=%d;\n", (int)sizeof(int)); @@ -6871,6 +6872,7 @@ case "$doublesize" in #ifdef I_STDLIB #include <stdlib.h> #endif +#include <stdio.h> int main() { printf("%d\n", (int)sizeof(double)); @@ -12660,7 +12662,7 @@ case "$dlsrc" in dl_dlopen.xs) echo "Checking whether your dlsym() needs a leading underscore ..." >&4 $cat >dyna.c <<'EOM' -fred () { } +void fred (void) { } EOM $cat >fred.c<<EOM @@ -12679,7 +12681,7 @@ $cat >fred.c<<EOM #include <link.h> #endif -extern int fred() ; +extern void fred(void) ; int main() { @@ -13713,6 +13715,7 @@ $cat >try.c <<EOP #ifdef I_STDLIB #include <stdlib.h> #endif +#include <string.h> #define FILE_ptr(fp) $stdio_ptr #define FILE_cnt(fp) $stdio_cnt int main() { @@ -16220,6 +16223,7 @@ echo "Checking to see if your libm supports _LIB_VERSION..." >&4 $cat >try.c <<EOCP #include <unistd.h> #include <math.h> +#include <stdio.h> int main (int argc, char *argv[]) { printf ("%d\n", _LIB_VERSION); @@ -22168,13 +22172,15 @@ pager="$ans" : see if ar generates random libraries by itself echo " " echo "Checking how to generate random libraries on your machine..." >&4 -echo 'int bar1() { return bar2(); }' > bar1.c +echo 'extern int bar2(); int bar1() { return bar2(); }' > bar1.c echo 'int bar2() { return 2; }' > bar2.c $cat > foo.c <<EOP #$i_stdlib I_STDLIB #ifdef I_STDLIB #include <stdlib.h> #endif +#include <stdio.h> +extern int bar1(); int main() { printf("%d\n", bar1()); exit(0); } EOP $cc $ccflags -c bar1.c >/dev/null 2>&1 @@ -22400,7 +22406,7 @@ EOM for nfd in 'int' 'size_t' 'unsigned long' 'unsigned' ; do for tmo in 'struct timeval *' 'const struct timeval *'; do case "$val" in - '') try="$extern_C select _(($nfd, $xxx, $xxx, $xxx, $tmo));" + '') try="$extern_C int select _(($nfd, $xxx, $xxx, $xxx, $tmo));" if ./protochk "$try" $hdrs; then echo "Your system accepts $xxx." val="$xxx" |