[Rd] aclocal.m4: R_PROG_F77_CC_COMPAT assumes executables w/o extension (PR#890)

[hoffmann@ehmgs2.et.tu-dresden.de]

Full_Name: Thomas Hoffmann
Version: 1.2.2 (and older)
OS: HP-UX, OS/2
Submission from: (NULL) (141.30.125.20)


The test defined in AC_DEFUN([R_PROG_F77_CC_COMPAT] (aclocal.m4:342) produces
an executable using (in line 393)

if ${CC-cc} ${LDFLAGS} ${MAIN_LDFLAGS} -o conftest conftest.o \ ....

This fails on systems that use an extension for executables, which can be
used via $ac_exeext in configure files. So it should read instead

if ${CC-cc} ${LDFLAGS} ${MAIN_LDFLAGS} -o conftest$ac_exeext conftest.o \ ....

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