New min size for SIZEOF_CURL_OFF_T breaks MS-DOS/DJGPP build

[SuperIlu]

I did this

Try building curl with mbedTLS-2.28.3 and DJGPP yields the following error

In file included from base64.c:27:
curl_setup.h:445:2: error: #error "too small curl_off_t"
  445 | #error "too small curl_off_t"
      |  ^~~~~

Build is done using the following command line
make -C $(CURL)/lib -f Makefile.mk CFG=-zlib-mbedtls-watt TRIPLET=i586-pc-msdosdjgpp WATT_ROOT=$(WATT32)

I expected the following

Working build as with 7.87.0

curl/libcurl version

source release for 8.0.1

operating system

MS-DOS/DJGPP using i586-pc-msdosdjgpp-gcc (GCC) 12.2.0

cause of error

The change from #10597 is not compatible with the SIZEOF_CURL_OFF_T as defined in curl-8.0.1\lib\config-dos.h

Solution

The build works if I use #define SIZEOF_CURL_OFF_T 8 in curl-8.0.1\lib\config-dos.h. My TLS tests are still able to do HTTPS requests as with 7.87.0

[bagder]

Would you be able to provide a PR with the change that makes it work for you?

[SuperIlu]

Sure, I'll try to get that done tomorrow...

[gvanem]

The build works if I use #define SIZEOF_CURL_OFF_T 8 in curl-8.0.1\lib\config-dos.h

I also did that and libcurl compiled on DJGPP. But I've not tried it. I assume it wont be able to transfer anything
above > 2 GByte with this 32-bit off_t. But I see there is a typedef long long off64_t; in DJGPP which is AFAICS
effective for fseeko64() only.

[SuperIlu]

Did some more tests yesterday with DOStodon and I noticed no problems.