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configure: conditionally enable pedantic-errors

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Enable pedantic-errors for GCC >= 5 with --enable-werror. Before GCC 5,
pedantic-errors was synonymous to -Werror=pedantic [0], which is still
the case for clang [1]. With GCC 5, it became complementary [2].

Also fix a resulting error in acinclude.m4 as main's return type was
missing, which is illegal in C99.

[0] https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/Warning-Options.html
[1] https://clang.llvm.org/docs/UsersManual.html#options-to-control-error-and-warning-messages
[2] https://gcc.gnu.org/onlinedocs/gcc-5.1.0/gcc/Warning-Options.html

Closes https://github.com/curl/curl/pull/2747
This commit is contained in:
Marcel Raad 2018-07-09 18:38:23 +02:00
parent a829c4b25e
commit d5c0351055
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2 changed files with 8 additions and 1 deletions
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acinclude.m4
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@ -2158,7 +2158,7 @@ AC_DEFUN([CURL_VERIFY_RUNTIMELIBS], [
dnl point also is available run-time!
AC_MSG_CHECKING([run-time libs availability])
CURL_RUN_IFELSE([
main()
int main()
{
return 0;
}