[R-pkg-devel] warning: type of ‘zhpevx_’ does not match original declaration [-Wlto-type-mismatch]

With gcc 8.3.0, gfortran 8.3.0, and ld 2.33.1 from the mingw64 part of
rtools40 on Windows, if I misdefine the typedef FC_LEN_T and use the
-flto flag I get the sort of error messages that you report.

c:\tmp\fortran>cat main.c
#include <string.h>
#include <stdio.h>

#ifdef USE_INT
typedef int FC_LEN_T;
#endif
#ifdef USE_LONG
typedef long int FC_LEN_T;
#endif
#ifdef USE_LONG_LONG
typedef long long int FC_LEN_T;
#endif

extern void sub_(char* word, double *ret, FC_LEN_T word_len);

int main(int argc, char* argv[])
{
    if (argc == 2) {
        double ret = 3. ;
        FC_LEN_T word_len = strlen(argv[1]);
        sub_(argv[1], &ret, word_len);
        printf("sizeof(FC_LEN_T)=%d, ret=%g\n", (int)(sizeof(FC_LEN_T)), ret);
        return 0;
    } else {
        return -1;
    }
}

c:\tmp\fortran>gcc  -flto -DUSE_INT main.c sub.f -lgfortran
main.c:14:13: warning: type of 'sub_' does not match original
declaration [-Wlto-type-mismatch]
 extern void sub_(char* word, double *ret, FC_LEN_T word_len);
             ^
sub.f:1:1: note: type mismatch in parameter 3
       subroutine sub(word, ret)
 ^
sub.f:1:1: note: type 'long long int' should match type 'FC_LEN_T'
sub.f:1:1: note: 'sub' was previously declared here
sub.f:1:1: note: code may be misoptimized unless -fno-strict-aliasing is used

c:\tmp\fortran>gcc  -flto -DUSE_LONG main.c sub.f -lgfortran
main.c:14:13: warning: type of 'sub_' does not match original
declaration [-Wlto-type-mismatch]
 extern void sub_(char* word, double *ret, FC_LEN_T word_len);
             ^
sub.f:1:1: note: type mismatch in parameter 3
       subroutine sub(word, ret)
 ^
sub.f:1:1: note: type 'long long int' should match type 'FC_LEN_T'
sub.f:1:1: note: 'sub' was previously declared here
sub.f:1:1: note: code may be misoptimized unless -fno-strict-aliasing is used

c:\tmp\fortran>gcc  -flto -DUSE_LONG_LONG main.c sub.f -lgfortran
<no warnings or notes>

Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Mon, Jul 6, 2020 at 4:39 PM Pierre Lafaye de Micheaux

[R-pkg-devel] warning: type of ‘zhpevx_’ does not match original declaration [-Wlto-type-mismatch]

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